What causes immunodeficiency?

  • A
    Enteric fever
  • B
    Defective thymus gland
  • C
    $AIDS$ virus
  • D
    Defective bone

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In what form do antigens exist?

Which of the following is a primary lymphoid organ?

$A$ molecule that elicits an immune response is called

The lymphoid tissue associated with the mucosa is known as .........

Antibodies . . . . . . are abundant in colostrum.

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